IS 10346:2004 Indian Standard DOLOMITE FOR METALLURGICAL AND REFRACTORY USE -- SPECIFICATION (Second Revision) ICS 73.080 0 BIS 2004 BUREAU MANAK OF BHAVAN, INDIAN STANDARDS ZAFAR MARG 9 BAHADUR SHAH NEW DELHI 110002 October 2004 Price Group 1 Ores and Raw Materials Sectional Committee, MTD 13 FOREWORD This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Ores and Raw Materials Sectional Committee had been approved by the Metallurgical Engineering Division Council. This standard was first published in 1982 and subsequently revised in 1991. In this revision the title has been modified to align with its scope, the requirement of degradation index, alkali content for all the three grades and CaO + MgO for Grade 2 and Grade 3 have been included. Limits of other constituents as well as size ranges have also been modified. DoIomite is used extensively in integrated steel plants as flux, for the production of iron in blast fhmace and fetling material in open hearth and other furnaces for the production of steel and also by the refractory manufacturers. This standard would be helpful in procuring standard dolomite for metallurgical and refractory use. For the purpose of deciding whether particular requirement of this standard is complied with the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2: 1960 `Rules for rounding off numerical values (revised)'. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. IS 10346:2004 Indian Standard DOLOMITE FOR METALLURGICAL AND REFRACTORY USE -- SPECIFICATION (Second Revision) 1 SCOPE This standard covers the requirements of dolomite for metallurgical and refractory use. 2 REFERENCES The following standards contain provisions which through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: IS No. 460 (Part 1): 1985 1387:1993 Title 5 GRADE DESIGNATION Dolomite for metallurgical and refractory use shall be of the following three grades as given in Table 1: a) b) c) For refracto~ use -- Grade 1, For steel making -- Grade 2, and For iron making -- Grade 3. 6 CHEMICAL COMPOSITION 6.1 The material shall comply with the chemical requirements as given in Table 1. Table 1 Chemical and Size Requirements (Clauses 5,6.1 and 7) SI Specification for test sieves: Part 1 Wire cloth test sieves (third revision) Constituents (2) Grade 1 (3) Grade2 (4) 50 Grade3 (5) 46 No. (1) i) 52 (CaO + MgO) content percent by mass, Min -- ii) CaO C4srrtent percent by mass, Min iii) MgO content,percent 20 by mass, Min 1 iv) SiOl conters~percent by mass,Mux v) Total acid insoluble, 2 percent by mass,Max vi) Alkali percentby 0.2 mass,Max vii) Size range 8t020mm Undersize Not more than 5% Oversize Not more than 5% NOTES General requirements for the supply of metallurgical materials (second revision) 30 20 2.0 3.0 0.2 8t020mm Not more than 5% Not more thSOs~o ­ 19 8 0.2 6t060mm Not more thll 5%'. Not more than 5% 1760 (Part 1): 1991 (Part 2): 1991 (Part 4): 1991 (Part 5): 1991 2109:1982 Methods of chemical analysis of limestone, dolomite and allied materials: Determination of loss on ignition (jhst revision) Determination revision) of silica ~irst dioxide Determination of carbon (first revision) Determination of chlorides @st revision) Methods of sampling dolomite, limestone and other allied materials (jirst revision) 1 The size ranges other than specified above shall be subject to agreement between the supplier and the purchaser. 2 In case of use as a fetling material: a) Size range may be up to 5-20 mm. b) CaO+MgO can be brought down to +)y. Min, MgO 19 percent Min, Si02 4 percent Max and total acid; insoluble 5 percent Max. 3 TERMINOLOGY For the putpose of this standard, the definition as given in IS 2109 shall apply. 4 SUPPLY OF MATERIAL General requirements relating to the supply of different grades of limestone for use in steel plants shall be as laid down in IS 1387. 6.1.1 The chemical composition, when analyzed by the method specified in relevant parts of IS 1760 or any other established instrumental/chemical method IS 10346:2004 shall conform to the requirements as given in Table 1. In case of dispute, the procedure given in relevant parts of IS 1760 shall be the referee method. However, when the method is not given in relevant parts of IS 1760, the referee method shall be as agreed to between the purchaser and the supplier. 7 PARTICLE SIZE The particle size of the material, when determined in accordance with IS 460 (Part 1) shall comply with the size requirements given in Table 1. 8 DECREPITATION/DEGRADATION INDEX 10.2 Tests for size determination shall be performed on the composite samples. 11 CRITERIA FOR CONFORMITY 11.1 For Individual Samples The mean and the range of test results shall be computed as follows: Mean (g) = Sum of individual test results Number of test results Decrepitation and degradation Index of dolomite shall be 10 percent maximum, each. The method for determination of decrepitation and degradation index is given in Annex A, for guidance. 9 SAMPLING Representative samples for testing shall be drawn according to the method of sampling giveninIS2109. 10 NUMBER OF TESTS 10.1 The testing for determination of calcium oxide, magnesium oxide and total insoluble including silica shall be carried out on each of the samples. Range (R) = Difference between the maximum and minimum values of test results For declaring conformity of the lot: a) b) ~ + 0.6 R, shall be less than or equal to the maximum specified requirements, and ~ ­ 0,6 R, shall be greater than or equal to the minimum specified requirements. 11.2 For Composite Samples For declaring the conformity of the lot of the requirements of characteristics tests on the composite sample, the test results shall satis~ the corresponding specified requirements. ANNEX A (Clause 8) GUIDELINES FOR DETERMINATION OF DECREPITATION/ DEGRADATION INDEX A-1 Dolomite is crushed to 25-30 mm size. A-2 About 3 kg. Sample is calcined in a furnace which has already attained a temperature of 1 000"C. The sample is kept in the furnace for two and half hours. The calcined dolomite thus obtained is cooled, weighed and then screened on a laboratory vibrating screen. The ­1 O mm fraction obtained is weighed. The percentage of ­1 Omm fraction with respect to the total mass of the calcined dolomite screened shall be the decrepitation index. A-3 Take 2 kg of +1O mm calcined dolomite after screening. Drop twice from a height of 2 m on a steel plate. Subject this material for screening at 10 mm. The proportion of ­1 O mm fraction expressed as percentage with respect to the material taken for the test shall be the degradation index. A-4 The desirable limits for decrepitation and degradation indices as determined above shall be 10 percent maximum, each. 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